When a key doesn't expire as expected in Redis, the 'redis expire not working' error is triggered. This can cause issues with memory usage and performance since the key-value store depends on an expiration time to automatically remove keys after a certain period.
There are various reasons why this error may arise. It could be due to Redis using persistence methods preventing automatic removal of expired keys, problems with the Redis configuration file like maxmemory policy being incorrectly set or maxmemory value being too low, or a problem with the application code that interacts with Redis like improper setting of the expiration time for keys.
There are multiple ways to resolve the 'redis expire not working' error. First, check the Redis configuration file to make sure that the maxmemory policy and maxmemory value are properly set. If necessary, adjust these values to allow Redis to consume more memory.
Another solution is to manually delete expired keys using the Redis command-line interface (CLI) or another Redis client library. This can be accomplished using the command
redis-cli keys '*:expired' | xargs redis-cli del, which deletes all expired keys.
If the problem persists, disable persistence methods allowing Redis to automatically remove expired keys. You can do this by setting the
save directive in the Redis configuration file to an empty string or by using the
appendonly no directive.
Finally, ensure that the application code correctly sets the expiration time for keys when using Redis. Double-check that the correct command is used and that the expiration time is set to a reasonable value. Following these steps should resolve the 'redis expire not working' error.